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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '764e81747f2492a5a5f7e140500b6e6e90b9c6c5c30a79bf34e78964eadb40de' 
  AND token = '0aIJ5R+AtTTc7RDmUxSV1KRW5quRf1LwR5PYX79MAzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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