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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40b3f023f2b7df7166d674e825dde62506afd512915e1c9d690dabff0b5ceaff' 
  AND token = '94K1J/4ieOPcoZg65lAak8JSW3MzKXkb7/oYNIWo5eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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