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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc0071896d1c3dd745b77c3a6c6e82d8e84d2645d267be1c05ae3303f92686a' 
  AND token = 'AtRoNzgbjjhwHyO0V8EOQfn9KiGfy8G/wxK10vnL9tc=' 
  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"
    }
  }
}