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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3551d9215cfa7f914c5d39b755fb4aaca6700587770c665c71dc949eb7b7b2c3' 
  AND token = 'urwhdB5IjycUwQSd8LIKMIeVS4vvbbDHiGsb+FLMwmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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