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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf2df2cac7ded7d987d8b5c3fe258542faea0457a022d9f82a895929abe51a7' 
  AND token = 'PeHQli2CjEk9SaAM7lE+56e8vywAN3iMOPh7F6yIyc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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