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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00581c1449f8503ed805ee7fb567ac0e5d3200ef4ab7b48c2b77968e0bcd489c' 
  AND token = 'eJH+cR21B8F5YmKyUsAD1+a2Lg7S8/G76QI+EOHgYZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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