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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea6bfe6843ef6310d46108d7c1c7a28a52d9f55f1ff08a51283e97f581ff4c0' 
  AND token = 'xIELC2gPw5eRSgjbu+eZ0W3og4OU5iNAFq+Kg6/0ehc=' 
  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"
    }
  }
}