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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7188103c2ae70fa08429ccf4f17e173b9ec20e3fcf3fb4f8c7511cad1c182421' 
  AND token = 'oE0fIpy9aJGb21ccSQQixuAxJBN5KUNpmtSHch5qmLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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