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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '486c8a949da4ce1d9e2e7ed1c0065629c25c067a7eb860a0c47f71ce01aa5da0' 
  AND token = '30R8HWpc/QQ7fNhnDZWmDHbA7y9UByHLG0tmJ2POkaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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