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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99569d442c6742809f66454c6dc23d18c67c86647ab4871e3063634f0653505c' 
  AND token = 'qIRRMThO/gCq8wK3u8X6ZgEs5yJJ8JOweCREmaeMvQU=' 
  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"
    }
  }
}