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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e129f7d4c1f5c1c7d2c002e350b732d4e76d867eb0bea41381031d16a0409362' 
  AND token = 'ThXrOWSMxg3Si0cgNGdgA2TR7uu3SVVjkdy+pb/bdV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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