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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2a21cc91095294f30f268c9724a2430eeb91052ddefd4aa84ad8c7e572ed2b2' 
  AND token = '4aS2i9nc73UNsqFT3ZyzJf0vDenlp0+AZjTdtqS/fek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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