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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '100d9161c652ff7777eaae5ca9813dc802b099cd1fb3808d03f66c3ef9a2446a' 
  AND token = 'm16tHQvU8bIu/rTPXjP0DG6975Ka/3i6qsJ1ofM1jJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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