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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3245c70aebb5f387a21c618ab16e02ba72ea418a6eb985032d828513be85917c' 
  AND token = '6EvyRuXZW1htLKOo3tI0mTBAs/4XdpUB1L6YsAFUnFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}