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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f0b87997df59e61a8ee01faf7e761f4715056ff1c3da33f02fdb2ed651e5413' 
  AND token = 'fArowYt2Et4mATc6kEXjeD0bgQCmBhlNCPJ9JD5QZz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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