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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f881f1f77ff34710f02cfaa45141699e06684ae07e91df74b8d9a7f8b9c55b1' 
  AND token = '7DAc9yRpHJjR9pOhQPluFdZiN7FvgLW6MxOHwBc93/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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