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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9819aae83a1be3a284dcc10a239a945b9f7a45f24e7450d3b3e1b60e7f55a7c' 
  AND token = 'g5I4cK8/Acctyg6VWhX7PIwXR1Lbl7uCv5MfgJ2akb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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