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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0030e8a32dc63cd12b7a50bb72abbca1efc8fc32ff4a63737d8f7feac4e06731' 
  AND token = 'tYM1ihKwrnJxkx2G8U2Vvv7gFS58SAZn0x2B+5XqMYk=' 
  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"
    }
  }
}