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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cc7ffbc205131027ee265418b384e3fdb9f4141dd8ca0f3964cd0819ee5c01c' 
  AND token = 'LMJTIYD/mKIql4tjAKtM/W7oo2mgt7cOfJHw4lGq3zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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