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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '211de50dc4c0e227f9efeef2e2653f26ed9dc5718207090afa4fe5c6bd5f0b6e' 
  AND token = '78Q+RdLsfgKd8uRGgyfCr6Jj/TjbaEEW/60Ns9R2pwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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