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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6720d28726cd0fbe513f701866c5d6ef0f9ac37d48973a6f98969d77c943b21d' 
  AND token = 'iIo9Amu49U7y5pzWLH/eBe8U7Csw8MZM2GnRJXabjTQ=' 
  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"
    }
  }
}