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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e963cfc86d98700b323e5f392433012e923c59a5f4a39579b9279de9651808d' 
  AND token = 'MeakM9qDVuN2RnUDCZYneQg1yCPtY3dK1T3+M0JYcBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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