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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade1284b778d96de7fadf18ede6604dfde786cad518902c3efb3a67fc5bb97e0' 
  AND token = '8vG0Hf8BEVOrZ4s4x+KVM8k2JAXOsZfi4m0l+9+O0rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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