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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c542428ac55ab8dc2c2df1093c8e19e6a2a84ec00edb885f7a0beb0edc636a' 
  AND token = 'GZI+ko5N1518DIx4Xd42mQ2hPF7BwUrmjVsjLgw1u4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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