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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19480dc44960ef3fbc2f6b938b622d5f936d6f47ad911afa6206c4c20121281c' 
  AND token = 'Le7TxhqPemoZ/XtSwOHwWIW9EuFYS28XPeMXnrlJlJA=' 
  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"
    }
  }
}