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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9255a1d7a06c0e40f6dde72f43c74dd9011ea731ba77e893a216a0bd5cfd298' 
  AND token = '6PELVhEedZ4IPO0VTFyp8RwH3ScUgZcgO7fAC1L48WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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