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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2396169af7c8450b9e0d1783a8d0c204e58210762f8d3f2cb249891abc9e6664' 
  AND token = 'QWmW6hmks6TbNt4ub/dXXiEOuK4PqOVp9F/CnPrND2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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