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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66bd5ef0e5e031c82698315a794cdccb03ecf44e6e7b1c02a9a814fa849c02a8' 
  AND token = '2zLjsaJzL3R0x917AUnM13K6uEYVo0VRYKhmhY0hErc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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