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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d760d61ed3c57b624b32060fba1b5fbb024a9658e24e13aa5b874c142c0c4c6' 
  AND token = '4/JyF2mH3GyiJ1QiBWKKzJbSNDHXBP2QnteTCsY2NSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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