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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f59f34338aa74888f1a19f86cb293880bd4c083d1b3bc0292babf66b6df60e' 
  AND token = '/Apspzce9pNO3ZwuINetzPHDoN2llqKM9y63MgR5m+4=' 
  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"
    }
  }
}