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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '182c1db609c6858949e10446681d47ffca7b31e90c8de8e1f7ee83b0c8d79448' 
  AND token = 'b9gs+qVxOTBX8vx5LeYgV2Uh6Uzq90FmrcY/EN7tMX8=' 
  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"
    }
  }
}