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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca9896c270e26637e2920b0984b4811f58f7c61dc1c742cd8caf3fe8a8cb58b' 
  AND token = 'yAvhnEgKI9rcLkMX36yCM4SjbxDYG8KOKS+qq+0lFks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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