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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1dfc32fbafbcec7590a8b74036394632f9ad3e260e0ce6df9d720fd2239d2f7' 
  AND token = 'G0Ef5JRyLrKHdygR24KfKk/pU5p0Ieex9uAMpbOxScI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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