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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fbfd3a8182751d38379b3255a0c8460173abae8b773cfad8b80d9d545f95896' 
  AND token = 'wN6W6eg2a2s/uFRC2UR4iOTXIK80O5P665WMJaFBz/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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