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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61ffd82785a0d1fb7869e3e64b0e37d5d85dd8f85723d26ea085ace03e1083c4' 
  AND token = 'lHnfvl+SpsCnlrjvTU02PUZ0Gbo9PIO5iQQkJhHDr0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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