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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '863bb3ccc0bb6aa4fbcae8d683b96ab02b0485e2aa8bf2fff1d73ce2f644af40' 
  AND token = 'oKlKYnPtQK0589lZ2b0cn37M1WSErzqGM2+WSb9Um4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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