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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5d0f6b9c5bedaad6c1d4f8a0485d11114bf2ac25a16f5a3a640963a0e3e5b82' 
  AND token = 'v+V057+NfJlRzyMkUWBb7d9lv/rxcymriTwLSdKPPJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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