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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f32fd023f3fb1144aed68fcfed68cb37085b62ec230a53547aa12416da9f1ba' 
  AND token = 'sLRXm4Lgb85moh5SUmgHf9HE9G2oiRE7nJuSDyQPTbw=' 
  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"
    }
  }
}