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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc761bc00d28440cbd627cb64d7463d986d53eb5010c49f15822a2c02e0918f' 
  AND token = '+5pWYoxZ5ozNX81opk97eFdbtyQ7j68esEoH3bLjFRs=' 
  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"
    }
  }
}