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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d7e37eaa9cfba74dd7becf91cd5d32a6e5a86a9170d58ebcf2b1da4dd53a46' 
  AND token = 'cB0DWGFKnRWOyxrRlnN7tm4dTwlzarATM/YojPuEhhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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