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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de6cd30dfd44f015edec546503b993bcbeb8c56f7c9586ec209587a0aef7fa9e' 
  AND token = 'yMdprRTg+0PX4E/9TMerLyODIfsq2n4n8fPCjkNbBDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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