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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e07d3b8dd153b789deba6c3a056a8e18a4dbc6bf762acc84397298d5718fa64' 
  AND token = 'XS9RR9B2ExCSDxckxlnCxD+bijxpPU73tRkvXbahP6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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