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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28c87c100c92c1a37cd3f68bf10c945b9ff93be905803d128062b0acb56c003b' 
  AND token = 'X2k124lKBfRji3tq8hqwoUSKXglpK9z1Lop/Y6E0HkQ=' 
  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"
    }
  }
}